<template>
  <el-breadcrumb class="app-breadcrumb" separator="/">
    <transition-group name="breadcrumb">
      <el-breadcrumb-item v-for="(item,index) in levelList" :key="item.path">
        <span
          v-if="item.redirect==='noRedirect'||index==levelList.length-1"
          class="no-redirect"
        >{{ item.meta.title }}</span>
        <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script>
import pathToRegexp from 'path-to-regexp';
import Cookies from 'js-cookie';

export default {
  data() {
    return {
      levelList: null
    };
  },
  watch: {
    $route() {
      this.getBreadcrumb();
    }
  },
  created() {
    this.getBreadcrumb();
  },
  methods: {
    getBreadcrumb() {
      var patharr = [];
      for (var m in this.$route.matched) {
        patharr.push(this.$route.matched[m].path);
      }
      // only show routes with meta.title
      // eslint-disable-next-line no-eval
      const logcal = eval('(' + window.localStorage.getItem('router') + ')');
      const localinfo = [];
      for (var i in logcal) {
        const localI = logcal[i];
        if (patharr.indexOf(localI.path) > -1) {
          localinfo.push(localI);
        }
        for (var p in localI.children) {
          const localC = localI.children[p];
          if (patharr.indexOf(localC.path) > -1) {
            localinfo.push(localC);
          }
        }
      }
      let matched = localinfo.filter(item => item.meta && item.meta.title);
      // let matched = this.$route.matched.filter(item => item.meta && item.meta.title);
      const first = matched[0];
      if (!this.isDashboard(first)) {
        matched = [{ path: '/home', meta: { title: '首页' } }].concat(matched);
      }
      this.levelList = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false);
    },
    isDashboard(route) {
      const name = route && route.name;
      if (!name) {
        return false;
      }
      return name.trim().toLocaleLowerCase() === '首页'.toLocaleLowerCase();
    },
    pathCompile(path) {
      const { params } = this.$route;
      const toPath = pathToRegexp.compile(path);
      return toPath(params);
    },
    handleLink(item) {
      const { redirect, path } = item;
      if (redirect) {
        this.$router.push(redirect);
        return;
      }
      this.$router.push(this.pathCompile(path));
    }
  }
};
</script>

<style lang="scss" scoped>
  .app-breadcrumb.el-breadcrumb {
    display: inline-block;
    font-size: 14px;
    line-height: 50px;
    margin-left: 8px;

    .no-redirect {
      color: #97a8be;
      cursor: text;
    }
  }
</style>
